Lock attachment.



A. R. LANGLEY.

LOCK ATTACHMENT.

APPLICATION mm Aums. l9l6.

INVENTOR ATTORNEV Anrnnnln. LANGLEY, or vroronra, enirrsn COLUMBIA, cAnAnA.

' LOCK immanent.

. j Specification of Letters Paar. Patented D c, 4, 1917,

Application filed. August 18, 1916. Serial No. 115,719.

To all whom it may concern:

Be it known tha'tI, ARTHUR R. LANGLEY,

a subject of the King of Great Britainfresiding at Victoria, in the Province of British Columbia and Dominion of Canada, have invented certain new and useful Improvements in Lock Attachments, if which the following is a specification.

This invention has relation to lock attachments, and has for an object to provide means whereby a key left in the lock after the same has been actuated to locking position may be held to prevent the turning of the key in the look from the outside by means of instruments.

In addition to the foregoing, my invention comprehends improvements in the details of construction and arrangement of parts to be hereinafter more fully described and particularly pointed out in the appended claim.

In the accompanying drawings in which similar and corresponding parts are designated by the same characters of reference throughout the several views in which they appear;

Figure 1, is a view in side elevation of a device constructed in accordance with my invention, illustrating its application to a key and door lock.

Fig. 2, is a view of the device shown in the preceding figure, in plan.

Fig. 3, is an end view of the device, and

Fig. 4, is a transverse section taken on the line 47-4: of Fig. 1.

With reference to the drawings, 1 inclicates the shank of a key, which upon reference to Fig. 1 will be seen to have been inserted in the lock of a door and turned to move the locking mechanism to locked position. In this position of the key, wherein the lugs are at rightangles to the keyhole the key cannot be withdrawn. Ordinarily this would be a safeguard against removal of the key from the outside were it not for the fact that the key may, by unauthorized persons, be turned in the look by suitable instruments and then pushed out, thereby permitting the insertion of another key in the lock and consequently the locking mechanism to be moved to open position.

I therefore, contemplate the provision of means whereby the unauthorized turning of the key from the outside, as mentioned above may be prevented. To this end I provide a device comprising coacting memhere 2 and 3, and rectangular in plan and somewhat elongated, *p'ivotally connected together at their ends as indicated at 4.

The movable terminals of the coacting sections are formed with rightangular inwardly directed portions 5, each of which is provided with a semi-circular recess 6, in which the shank 1 of the key is received. The member 3 in addition to the bent terminal 5 is provided adjacent thereto, with a web 7 of a size permitting its entrance into the keyhole of the lock.

Each of the members 2 and 3, are further provided adjacent their point of mutual connection, with extensions 8, prolonged and lying substantially in the plane of said members, one of said members being provided with an internally threaded opening. A set screw 9 is threadedly engaged in said opening and is adapted to hear at its end against the inner face of the other extension. In this manner obviously when the set screw 9 is rotated, the extensions may be separated thereby moving the members 2 and 3 toward each other, the shank of the key being disposed between said members, obviously it is securely clamped and the key and device held against relative rotation. When the device is clamped about the key and the web 7 inserted in the keyhole, it will be apparent that a turning movement of the device relative to the key shank, and consequently the key shank relative to the door lock will be absolutely prevented. The device therefore provides a perfect safeguard against unauthorized removal of the key from the lock, and thereby increases the efficiency of the locking mechanism as a whole.

While I have illustrated and described my invention with some degree of particularity I realize that in practice various alterations thereover may be made, and I therefore reserve the right and privilege ofchanging the form of the details of construction or otherwise altering the arrangement of the correlated parts without departing from the spirit of the invention or the scope of the appended claim.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

A key fastener including a pair of stationary relatively movable jaws adapted to engage the stem of a key at a point adjacent the bit thereof, said jaws lying in contiguous relation to the stem of the key and ment to the key, and a I'ug onone of the 10 adapted to receive the bow therebetween t0 jaws adapted to enter the keyhole.

prevent relative rotation of the jaws, ex- In testimonywhereof-l affiX'my signatensions on this jawfs extenided beyondhthe ture in presence of two witnesses.

pivotal point t 1ere0 one 0 said jaws aving a threaded aperture, a set screw pene- ARTHUR trating said aperture, to engage the other i extension whereby to retain the jaws against separation subsequent to attach Witnesses:

LEON J. HANESUSA, SPROTT BALCOM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. a 1 

